This sounds like a common scam to me! It's called 'bait and switch'.
IMO you still have a legal standing. Just keep all the emails or maybe tape a conversation with her where she admits that the puppy you wanted died and you have to take another one and she doesn't want to give all your money back.
I'm so sad to hear the same thing over and over again and all on the innocent backs of animals and trusting people...
